The answer would be a trapezoid.
We have that an inverse variation in a function is given by:
![y = k / x ](https://tex.z-dn.net/?f=y%20%3D%20k%20%2F%20x%0A)
We must find the value of the constant k.
To do this, we substitute the values of x1 = 12, y1 = 15.
We have then:
![15 = k / 12 ](https://tex.z-dn.net/?f=15%20%3D%20k%20%2F%2012%0A)
Clearing k we have:
![k = (15) * (12) k = 180](https://tex.z-dn.net/?f=k%20%3D%20%2815%29%20%2A%20%2812%29%0A%0Ak%20%3D%20180)
Substituting the value of k we have that the inverse variation is:
![y = 180 / x ](https://tex.z-dn.net/?f=y%20%3D%20180%20%2F%20x%0A)
For y2 = 3 we have:
![3 = 180 / x2 ](https://tex.z-dn.net/?f=3%20%3D%20180%20%2F%20x2%0A)
Clearing x2 we have:
Answer:
Full turn = 360°
Number of 90° = 360 ÷ 90 = 4
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Answer: It takes 4 90° to make a full turn.
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A. For each year a person ages his or her maximum heart rate decreases by 220 beats per minute.!